Insulator



Nov. 13, 1928. 1,691,330

A. O. AUSTIN INSULATOR Original Filed April 6. 1921 fvei/or? alinement, as is the usual arrangement. yB'y;

" 'subautute;m a ncmon seml 1C0. asaosafn-ieaapru 6,1921. w 8efla1'NoJ197876.

l v particularly Patented Nov. 13,, 1928; l L

r smemmsrmm onto, assieudafny'ivmsnu teammates; "ro irnn omo muss-commas; or mansrmnn, c1110, A 'conr oim'rion JERSEY.

- This application is a substitute for my abandoned application, Serial Number 459 '063,filed=April6,1921. r. i

tors, and es aeei ally to suspension insulators in :series,' and has for 1 one: of itsobjectsthe I. protection of such i'nsu'lators from for.- eign 'matter which occasionally causes injurious-andde'structive arcing, e r I A "further object 'is to provide mechanism oftheclass named which shall be'of improved constructionand operation.

.. The invention islexemphfied in the "com-v bination and arrangement of parts shown in the accompanying :drawing and describedin the following specification,.-andit is more out in the appended pointed claims. -In -the draWingI Y Fig. l iSflIl BlGVBllOll of a series of insulators showing one 1 embodiment of the pres-- ent inventionyand A fieation. e p I In insulatorpracticeiit sometimeshappens that falling matter, suclr as adroppings from birds, will strike a string of insulators and running from the edge of the uppermost insulator of the string will, form flipfltll' from one "insulator toanother in the string, cause ingaanundesirable and "injurious are. o, Foreign matters accumulating on the uppermost insulator will sometimes wash off in rain and form a stream connecting theedgesofi the insulators where theedges are in substantial placing insulator members'having large'diameters tatidiflerent-lpoints in the string a stream of conducting material which will T permit an arc to form, may be broken'up and the are prevented. The insulators of smaller diameter will be largely protected and kept clean so that there will be'less danger of arcover, eitherfrom falling material or from accumulations of conducting material. "By thus maintaining. the normal insulation of the small members, there is less danger of arcover under severe fog or storm conditions. The large members inthe string may be so designed that they willrnot carry undue stress by properlyregulating their electrostatic capacity, surface resistance,and section length. The same result for protection from falling I with a possible resulting are.

trough or retarding or dlrectlng means may I v g r v 1,691,330

w f 1 T insULA'roR- material may =be'obtainedby placing a large.

metal hood at the top of a string on by-attachthe string, or to theinsulating flanges. This, however may ben1ore eXpensiVe,'or if the metal slneldsare cheaply made'theywillde' teriorate in a few years and'cause trouble by-coming loose. "lheipresence of a metal or conducting hood} tends to take I the electrical stress off the members at the upper part ofthe string; sincethemembers at the upperpart of thestring ordinarilyhave a lower stless c the protecting i covering for the upp'er lpart F lg. 2' is a" vertical sectional view of amod1- the string Without disturbing the electrical gradient as woulclbe the caseavith 'a meta-l shield. NVhere' it is desired to'obtain the advantage of the large protecting hood'and Where its insulating properties as-an integral member of theregular-insulating flangelisnot' desirable, the protecting flange may be in the form of a separate ring and attached to the insulator coupling or to the insulating flange by suitable means. The protecting ring may have a trough or depression to prevent a stream of conducting material falling rapidly The same be used Where the large hood or flange is an integral part of the insulating member. By placing a small insulating member on the tower side of the large protecting hood This applicationnled uune 10, ran.

p y ing-hoods' orflanges at dili'erent points'in This invention relates to electric 1n'sula-- flanges are integral with the string they tend to keep the are away from the smaller members in case of a flashover.

In the drawing, the numeral 10 designates a supporting member, such as an I-beam of a high tension line tower. Suspended from the member 10 is a string of insulators 11 having flanges or petticoats 12 otusual form. The uppermost insulator 13 of the string is provided with a flange i i of larger diameter the top of the string aflords suflicient protection tor the entire string. The string in this instance is shown as carrying a high tension line 17 supported by a saddle member 18 suspended from the lowermost insulator.

The insulator 13 is provided with a separate flange member 1 L made to fit over a restricted portion of the insulator,'such as the cap, and rest on a rib 2O commonly provided at the lower edge of the cap. The flange member 1% is turned up at its edges to provide a gutter 21 for retaining any material deposited on the flange and preventing such material from falling in a stream from the edge of the flange at one time.

In Fig. 2 a flange member 22 is provided which is shaped to rest upon the insulator petticoat 12 instead of the supporting cap. Where the flanges are made detachable or separate they may be readily attached to lines already installed without the necessity of replacing one of the insulator units. As shown in the drawing, the separate flange members 14 and 22 have otiset reinforcing ribs extending about their central openings.

I claim Y 1. The combination with a series string of detachably connected insulators, each having an upper approximatel cylindrical restricted portion and a re ially projecting flange, of supplemental flanges of dielectric material, each having a diameter greater than the maximum diameter of said insulators, said supplemental flanges each having an opening therethrough of a size to receive the upper restricted portion of one of said insulators to permit the supplemental flange to rest on the flange-of the insulator and support said supplemental flange on said insulator, said supplemental flanges each having a retaining groove in theupper face thereof adjacent to the outer edge of said supplemental flan e and having a reinforcement extending about the periphery of the opening through the supplemental flange, one of said supplemental flanges being carried on the uppermost insulator of the string and another of said supplemental flanges being carried on an insulator between the ends of the string, the intervening insulators of the string being without supplemental flanges.

2. The combination with a series strin of detachably connected insulators, each aving an upper approximately 0 lindrical re- .stricted portion and a radial y projecting flange of supplemental flanges of dielectric material, each having a diameter greater than the maximum diameter of said insulators, one of said supplemental flanges having an opening therethrough of a size to receive the upper restricted portion of one of said insulators, to permit the supplemental flange to rest on the flange of the insulator and support said supplemental flange on said insulator, said supplemental flange being carried on the uppermost insulator of the string and having a reinforcement extending about the periphery of the opening therethrough, another of said supplemental flanges being carried on an insulator between the ends of the string, the intervening insulators of the string being without sup lernental flanges.

In testimony whereoi I have signed my name to this specification on this 6th day of June, A. D. 1927.

ARTHUR o. AUSTIN. 

